\( A \) and \( B \) are two concentric spherical shells. If \( A \) is given a charge \( +q \) w...

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\( A \) and \( B \) are two concentric spherical shells. If \( A \) is given a charge \( +q \) while \( B \) is earthed as shown in figure, then
(a) charge on the outer surface of shell \( B \) is zero
(b) the charge on \( B \) is equal and opposite to that of \( A \)
(c) the field inside \( A \) and outside \( B \) is zero
(d) All of the above
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